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The original development by Ziegler led to what appears to be an almost endless number of patents for various coordination-type catalysts and processes. As described in Chap. 4, such catalysts have been vastly improved. Progress was made toward enhanced efficiency and selectivity. The amount of polymer produced per g...	{ "Header 1": "Chapter 6 Common Chain-Growth Polymers", "token_count": 2040, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The product generally has fewer than three branches per thousand carbon atoms [9]. Table 6.2 summarizes the properties of various polyethylenes. #### 6.1.4 Materials Similar to Polyethylene Materials that are quite similar to polyethylene can be obtained from other starting materials. The most prominent is format...	{ "Header 1": "Chapter 6 Common Chain-Growth Polymers", "token_count": 2013, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Further improvement was achieved by supporting TiCl<sup>3</sup> on MgCl<sup>2</sup> or by producing a supported catalyst by reacting TiCl<sup>4</sup> with Mg(OC2H5) or with other magnesium compounds. This raised the productivity to over 3,000 g of polymer for every gram of Ti [\[46](#page-408-0)]. The products, however...	{ "Header 1": "Chapter 6 Common Chain-Growth Polymers", "token_count": 2042, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The catalysts were deactivated and dissolved out of the products with alcohol containing some HCl, or removed by steam extraction. This was followed by extraction of the amorphous fractions with hot liquid hydrocarbons. Later bulk polymerization processes were developed where liquid propylene was either used as the o...	{ "Header 1": "Chapter 6 Common Chain-Growth Polymers", "token_count": 1452, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The original commercial methods for preparing high molecular weight polyisobutylene by cationic polymerization in good yields were reported in 1940. The reaction was carried out at -40 to $-80^{\circ}$ C in a diluent with BF<sub>3</sub> catalysis [72]. This developed into current commercial practices of polymerizing i...	{ "Header 1": "6.3 Polyisobutylene", "token_count": 1942, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Table 6.6 Properties of poly(a-olefin)s \| Monomer \| State \| MP (C) \| \|---------\|---------------------------------\|---------\| \| \| Crystalline \| 136 \| \| \| Crystalline \| 165–168 \| \| \| Crystalline \| 124–13...	{ "Header 1": "6.3 Polyisobutylene", "token_count": 1469, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Many copolymers of ethylene with a-olefins are prepared commercially. Thus ethylene is copolymerized with butene-1, where a comonomer is included to lower the regularity and the density of the polymer. Many copolymers are prepared with transition metal oxide catalysts on support. The comonomer is usually present in app...	{ "Header 1": "6.5.2 Copolymers of Ethylene with a-Olefins and Ethylene with Carbon Monoxide", "token_count": 1187, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
$$\begin{array}{c\|c} & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & &...	{ "Header 1": "6.5.2 Copolymers of Ethylene with a-Olefins and Ethylene with Carbon Monoxide", "token_count": 1347, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Various copolymers of ethylene with vinyl acetate are prepared by free-radical mechanism in emulsion polymerizations. Both reactivity ratios are close to 1.0 [[106\]](#page-409-0). The degree of branching in these copolymers is strongly temperature-dependent [[107\]](#page-409-0). These materials find wide use in such ...	{ "Header 1": "6.5.4 Copolymers of Ethylene with Vinyl Acetate", "token_count": 212, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Many different polymers of conjugated dienes are prepared commercially by a variety of processes, depending upon the need. They are formed by free-radical, ionic, and coordinated anionic polymerizations. In addition, various molecular weights homopolymers and copolymers, ranging from a few thousand for liquid polymers ...	{ "Header 1": "6.6 Homopolymers of Conjugated Dienes", "token_count": 1603, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
\| \| Microstructure (%) \| \| \| \|--------------------------------------\|--------------------\|-----------\|--------\| \| Catalyst \| Cis-1,4 \| Trans-1,4 \| 1,2 \| \| TiI4<br>/Al(C2H5<br>)3 \| 95 \| 2 ...	{ "Header 1": "6.6 Homopolymers of Conjugated Dienes", "token_count": 1999, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
#### 6.6.2.2 Synthetic Polyisoprenes In following natural rubber, the synthetic efforts are devoted to obtaining very high cis-1,4 polyisoprene and to forming a synthetic "natural" rubber. Two types of polymerizations yield products that approach this. One is through use of Ziegler–Natta type catalysts and the ot...	{ "Header 1": "6.6 Homopolymers of Conjugated Dienes", "token_count": 2040, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Ratios of Ti:Al between 0.5:1 and 1.5:1 yield the cis isomer. A 1:1 ratio is the optimum. Ratios of Ti:Al between 1.5:1 and 3:1 yield the trans structures [\[123](#page-409-0)]. The titanium to aluminum ratios also affect the yields of the polymers as well as the microstructures. There also is an influence on the m...	{ "Header 1": "6.6 Homopolymers of Conjugated Dienes", "token_count": 376, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Early attempts at preparations of synthetic rubbers resulted in developments of elastomers from 2,3-dimethylbutadiene. The material, called "methyl rubber," was claimed to yield better elastomeric properties than polybutadiene. Methyl rubber was produced in Germany during World War I where the monomer was prepared from...	{ "Header 1": "6.7 Methyl Rubber, Poly(2,3-dimethylbutadiene)", "token_count": 2028, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Thus, cis-1,4 syndiotactic polymers form in aromatic solvents and trans-1,2 in aliphatic ones. The preparations require cobalt halide/aluminum alkyl dichloride(or dialkyl chloride) catalysts in combinations with Lewis bases. To form a trans-1,4 structure, a catalyst containing aluminum to titanium ratio close to ...	{ "Header 1": "6.7 Methyl Rubber, Poly(2,3-dimethylbutadiene)", "token_count": 928, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Several different elastomers, copolymers of butadiene, are produced commercially. The major ones are copolymers of butadiene with styrene and butadiene with acrylonitrile. Some terpolymers, where the third component is an unsaturated carboxylic acid, are also manufactured. Block copolymers of isoprene with styrene and ...	{ "Header 1": "6.11 Copolymers of Dienes", "token_count": 1580, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Butadiene–acrylonitrile rubbers are another group of useful synthetic elastomers. These copolymers were originally developed in Germany where they were found superior in oil resistance to the butadiene–styrene rubbers. Commercially, these materials are produced by free-radical emulsion polymerization very similarly to ...	{ "Header 1": "6.11.2 GR-N Rubber", "token_count": 447, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Styrene is one of those monomers that lends itself to polymerization by free-radical, cationic, anionic and coordination mechanisms. This is due to several reasons. One is resonance stabilization of the reactive polystyryl species in the transition state that lowers the activation energy of the propagation reaction. An...	{ "Header 1": "6.12.1 Preparation of Polystyrene by Free-Radical Mechanism", "token_count": 2039, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Grassi and Zambelli claim that the syndiotactic styrene polymerization proceeds through a secondary insertion of styrene into Ti–alkyl (or growing polymer chain) bond. In the half titanocene catalyst, the polymer chain appears to be Z 6 -coordinated to the metal of the active species [[179\]](#page-410-0): $$\begin{a...	{ "Header 1": "6.12.1 Preparation of Polystyrene by Free-Radical Mechanism", "token_count": 2023, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The activity of the catalyst and the DP depend on the ratio of aluminum to titanium, the nature of the solvent, and on the aging of the catalyst [[189\]](#page-410-0). The optimum ratio of the aluminum alkyl to titanium chloride is 1.0–1.2. Mixing and aging of the catalyst must be done below room temperature, and the v...	{ "Header 1": "6.12.1 Preparation of Polystyrene by Free-Radical Mechanism", "token_count": 866, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Many copolymers of styrene are manufactured on a large commercial scale. Because styrene copolymerizes readily with many other monomers, it is possible to obtain a wide distribution of properties. Random copolymers form quite readily by free-radical mechanism [[185,](#page-410-0) [194\]](#page-411-0). Some can also be ...	{ "Header 1": "6.13 Copolymers of Styrene", "token_count": 205, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
For many applications, the homopolymer of styrene is too brittle. To overcome that, many different approaches were originally tried. These included use of high molecular weight polymers, use of plasticizers, fillers (glass fiber, wood flour, etc.), deliberate orientation of the polymeric chains, copolymerization and ad...	{ "Header 1": "6.13.1 High-Impact Polystyrene", "token_count": 2023, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The reaction with oxygen results in formation of low molecular weight polymeric peroxides that subsequently decompose to formaldehyde and methyl pyruvate [210]: $$O$$ + $O_2$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ Oxygen is less effective in inhibiting polymerizations of acrylic esters. It rea...	{ "Header 1": "6.13.1 High-Impact Polystyrene", "token_count": 2019, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
#### 6.14.2 Acrylic Elastomers Polymers of lower n-alkyl acrylates are used commercially to only a limited extent. Ethyl and butyl acrylates are, however, major components of acrylic elastomers. The polymers are usually formed by free-radical emulsion polymerization. Because acrylate esters are sensitive to h...	{ "Header 1": "6.13.1 High-Impact Polystyrene", "token_count": 2042, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The products, however, are often insoluble in such solvents. In addition, there is a tendency for the polymer to be yellow. This is due to some propagation taking place by 1,4 and by 3,4 insertion in addition to the 1,2 placement [[253,](#page-412-0) [254\]](#page-412-0): $$\begin{array}{c\|c} & & & \\ & & & \\ & & & ...	{ "Header 1": "6.13.1 High-Impact Polystyrene", "token_count": 2034, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Methacrylonitrile polymerizes readily in inert solvents. The polymer, depending on the initiator and on reaction conditions, is either amorphous or crystalline. Polymerizations take place over a broad range of temperatures from ambient to 5 C, when initiated by Grignard reagents, triphenyl ethylsodium, or sodium in l...	{ "Header 1": "6.13.1 High-Impact Polystyrene", "token_count": 379, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Commercially, acrylamide is formed from acrylonitrile by reaction with water. Similarly, the preferred commercial route to methacrylamide is through methacrylonitrile. Acrylamide polymerizes by free-radical mechanism [[270\]](#page-412-0). Water is the common solvent for acrylamide and methacrylamide polymerizations be...	{ "Header 1": "6.16 Polyacrylamide, Poly(acrylic acid), and Poly(methacrylic acid)", "token_count": 1759, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Mary different copolymers of fluoroolefins are possible and were reported in the literature. Commercial use of fluoroolefin copolymers, however, is restricted mainly to elastomers. Such materials offer superior solvent resistance and good thermal stability. The elastomers that are most important industrially are viny...	{ "Header 1": "6.17.5 Copolymers of Fluoroolefins", "token_count": 1006, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
These are poly(1,1-dihyroperfluorobutyl acrylate): $$\begin{array}{c\|c} \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline &...	{ "Header 1": "6.17.5 Copolymers of Fluoroolefins", "token_count": 1895, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Poly(vinyl chloride) is used in industry on a very large scale in many applications, such as rigid plastics, plastisols, and surface coatings. The monomer, vinyl chloride, can be prepared from acetylene: + HCl Cl The reaction is exothermic and requires cooling to maintain the temperature between 100 and 108C. The...	{ "Header 1": "6.17.7 Poly(vinyl chloride)", "token_count": 2026, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The crystalline areas are syndiotactic [[317,](#page-413-0) [318\]](#page-413-0). Poly(vinyl chloride) is soluble at room temperature in oxygen-containing solvents, such as ketones, esters, ethers, and others. It is also soluble in chlorinated solvents. The polymer, however, is not soluble in aliphatic and aromatic h...	{ "Header 1": "6.17.7 Poly(vinyl chloride)", "token_count": 2021, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Poly(vinyl alcohol) can be prepared from either poly(vinyl esters) or from poly(vinyl ethers). Commercially, however, it is prepared exclusively from poly(vinyl acetate). The preferred procedure is through a transesterification reaction using methyl or ethyl alcohols. Alkaline catalysts yield rapid alcoholyses. A typic...	{ "Header 1": "6.17.7 Poly(vinyl chloride)", "token_count": 735, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
- 1. Discuss copolymers of ethylene with propylene. How are they prepared? What catalysts are used in the preparations? How are ethylene–propylene rubbers cross-linked? - 2. What are the copolymers of ethylene with higher a-olefins and why are they prepared and how? - 3. Discuss the copolymers of ethylene with vinyl ac...	{ "Header 1": "Section 6.5", "token_count": 883, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
1. Discuss preparation, properties, and uses of poly(vinyl acetate). #### Section 6.19 1. How is poly(vinyl alcohol) prepared, used, and converted to poly(vinyl acetal)s? - 1. E.W. Fawcett, O.R. Gibson, M.W. Perrin, J.G. Paton, and E.G, Williams, Brit. Pat. # 571,590 (1937) - 2. R.O. Symcox and P. Ehrlich, *J. ...	{ "Header 1": "Section 6.18", "token_count": 2008, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
U.S. Patents # 3,134,642 (May 26, 1964); 2,980,664 (April 18, 1961); 3,055,878 (Sept,25, 1962); 3,216,987 (Nov. 9, 1596); 3,303,179 (Feb. 7, 1967); 3,328,375 (June 27, 1967); 3,362,916 (Jan 9 1964); 3,313,791 (April 11, 1967); 3,255,167 (June 7, 1966); German Patent # 1,236,789 (March 16, 1967); 1,234,218 (April 6, 196...	{ "Header 1": "Section 6.18", "token_count": 2037, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Polymer Sci., 1981, 36, 151 - 53. J. Lewis, P.E. Okieimen, and G.S. Park, J. Macromol. Sci.-Chem., 1982, A17, 1021 - 54. F.A. Bovey, K.B. Abbas, F.C. Schilling, and W.H. Starnes, Jr., Macromolecules,1975, 8, 437 - 55. D. O'Sullivan, Chem. Eng. News, p. 29 (July 4, 1983) - 56. D. Cam, E. Albizzati,...	{ "Header 1": "Section 6.18", "token_count": 2010, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Congress, Macromol. Prepr.,1971, 2, 712 - 92. C. Cozewith and G. Ver Strate, Macromolecules, 1971, 4, 482 - 93. A. Akimoto, J. Polymer Sci., Polymer Chem. Ed., 1972, 10, 3113 - 94. C.A. Lukach and H.M. Spurlin, in Copolymerization, (G.E. Ham, ed.), Interscience, N.Y., 1964 - 95. G. Natta, G. Mazzant...	{ "Header 1": "Section 6.18", "token_count": 1994, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
North, Polymer, 1966, 7(3), 113 - 133. W. Marconi, A. Mazzei, S. Cucinella, and M. Cesari, J. Polymer Sci., 1964, A-1,2, 426 - 134. G. Natta, M. Farina, M. Donati, and M. Peraldo, Chim. Ind. (Milan), 1960, 42, 1363 - 135. G. Natta, M. Farina, and M. Donati, Makromol. Chem., 1961, 43, 251 - 136. G....	{ "Header 1": "Section 6.18", "token_count": 2013, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Natta, J. Polymer Sci., 1955, 16, 143 - 173. C.G. Overberger, J. Polymer Sci., 1959, 35. 381 - 174. A.C. Shelyakov, Dokl. Akad. Nauk USSR, 1958, 122, 1076 - 175. D.Y. Yoon, P..R. Sundararajan, and P.J. Flory, Macromolecules, 1975, 8, 776 - 176. V.A. Kargin, V.A. Kabanov and II. Mardenko, Polym. *S...	{ "Header 1": "Section 6.18", "token_count": 2006, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Polymer Sci., 42, 367 (1960) - 217. F.J. Welch, U.S. Patent # 3,048,572 (Aug, 7, 1962) - 218. H. Nagai, J. Appl. Polymer Sci., 1963, 7, 1697 - 219. S. Smith, J. Polymer Sci., 1959, 38, 259 - 220. W.G. Gall and N.G. McCrum, J. Polymer Sci., 1961, 50, 489 - 221. M.R. Miller and G.E. Rauhut, J. Am. Chem*. ...	{ "Header 1": "Section 6.18", "token_count": 1979, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Chem., Japan, 1957, 27, 22 - 258. N. Shavit, A. Oplaka, and M. Levy, J. Polymer Sci., 1966, A-1,4, 2041 - 259. N. Shavit, M. Konigsbuch, and A. Oplaka, U.S. Patent #3,345,350 - 260. N. Shavit and M. Konigsbuch, J. Polymer Sci., 1967, C(16), 43 - 261. S. Amdur and N. Shavit, J. Polymer Sci. 1967, A-1,5, ...	{ "Header 1": "Section 6.18", "token_count": 1997, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Robila, J. Polymer Sci, Polymer Chem., Ed., 1978, 16, 2741 - 301. G. Vancso, 0. Egyed, S. Pekker, and A. Janossy, Polymer, 1982, 23, 14 - 302. K.H. Reichert and H.U. Moritz, J. Appi. Polymer Sci., 1981, 36, 151 - 303. L. Petiaud and O. Pham, Makromol. Chem., 1977, 78, 741 - 304. J.W.L. Fordham, P.H. Bur...	{ "Header 1": "Section 6.18", "token_count": 918, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Two types of monomers can undergo step-growth polymerizations [[1,](#page-540-0) [4,](#page-540-0) [5\]](#page-540-0). Both are polyfunctional, but one type possesses only one kind of functionality. An example is adipic acid that has two functional groups, but both are carboxylic acid groups. Another one is hexamethyle...	{ "Header 1": "7.1 Mechanism and Kinetics of Step-Growth Polymerization", "token_count": 219, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Kinetic considerations are of paramount importance in understanding the mechanism of step-growth polymerization [[1\]](#page-540-0). As stated in Chap. [1,](http://dx.doi.org/10.1007/978-1-4614-2212-9_1) chain-growth polymerizations take place in discreet steps. Each step is a reaction between two functional groups, li...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2031, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
When there is no catalyst present and the carboxylic acid assumes the role of a catalyst itself, then a third-order rate expression (shown above) must be employed: $$-d[M]/dt = k[M]^3$$ By integrating the third-order rate expression, one obtains: $$1/[M]^2 - 1/[M_o]^2 = 2kt$$ and, by substituting for [M] the Ca...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2039, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The Carothers equation, discussed above, states that $$p = (N_{\rm o} - N)/N_{\rm o}$$ where N<sup>o</sup> and N represent the quantities of monomer molecules present initially and at a conversion point p. The number of functional groups that have reacted at that point is 2(N<sup>o</sup> N). In the modifi...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2042, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The linear polyesters became 7.2 Polyesters 413 commercially important materials early in this century and still find many uses in industry. The earliest studies reported condensations of ethylene, trimethylene, hexamethylene, and decamethylene glycols with malonic, succinic, adipic, sebacic, and ortho phthalic a...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2018, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Substituted ureas form as by-products: $$RN$$ $NR$ + $RCOOH$ + $R'OH$ $\longrightarrow$ $RCOOR'$ + $ROOR'$ The reaction is useful in preparations of isoregic ordered chains with translational polar symmetry. It can also be applied in polymerizations of functional or chiral monomers. #### 7.2.1.2 Commerc...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2031, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
This polymer is also formed from dimethyl terephthalate and the diol by a transesterification reaction. The material has the following structure: O O O O n The polymer is stiffer than poly(ethylene terephthalate) and higher melting. 7.2 Polyesters 421 A polyester is being manufactured in Japan from a methyl est...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2040, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
7.2 Polyesters 423 Table 7.1 Approximate melting points of polyesters \| Dicarboxylic acid \| Glycol \| C)<br>Tg<br>( \| C)<br>Tm<br>( \| \|-----------------------\|---------------\|---------------\|-----------------------\| \| HOOCCOOH \| HOCH2CH2OH \| – \| 172 ...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 1000, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The materials in this group are linear copolyesters. One of the dicarboxylic acids is an aliphatic unsaturated diacid. The unsaturation is introduced into the polymer backbone for the purpose of subsequent cross-linking. Unsaturated polyester technology was developed for use in glass fiber laminates, thermosetting mold...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 777, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The reaction was illustrated as follows: $$\bigcap_{R} + O = \bigcap_{O} O = \bigcap_{PPh_3} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2048, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
In the first one, called fatty acid process, a free fatty acid is coesterified directly with the dibasic acid and the polyol at 200–240°C. The reaction may be carried out without a solvent by first heating in an inert atmosphere. At the end, an inert gas may be blown into the resin from the bottom of the reaction ket...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2003, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The two polymers form from their cyclic dimers by cationic ring opening polymerizations with the aid of Lewis acids: O O O O O O n O O O O O O #### 7.3 Polyamides The family of synthetic polymeric materials with amide linkages in their backbones is large. It includes synthetic linear aliphatic polyamides, which c...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2030, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Here cyclohexane is converted in one step to cyclohexanone oxime hydrochloride [\[57](#page-541-0)]: NOCI $$hv$$ NO • + CI • + HCI $hv$ + NO • + HCI $hv$ NO • + HCI Another process uses ketene to form cyclohexene acetate [\[58](#page-541-0)]: $$\begin{array}{c\|ccccccccccccccccccccccccccccccccccc$$ Among som...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2036, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The process starts with telomerization of ethylene [\[66](#page-541-0)]. A free-radical polymerization of ethylene is conducted in the presence of chlorine compounds that act as chain-transferring agents. The reaction is 7.3 Polyamides 435 \| Table ' \| 73 \| Compositions of telome \| rc \| \|---------\|----\|---------------...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2034, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
$$\begin{array}{cccccccccccccccccccccccccccccccccccc$$ A 60–75% solution of the salt in water is then fed into a reaction kettle. In a typical batch process, some acetic acid may also be added if it is desired to limit molecular weight (10,000–15,000). The temperature in the reaction kettle is raised to 220°C, and ...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2029, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The melt viscosity of these materials, however, is generally low In any one series of melting points of polyamides, polymers that contain even numbers of methylene groups between amide linkages fall on a higher curve than those that contain odd ones do [72]. This is due to the crystalline arrangement of the polymeric...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 374, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
A formation of one such dimer acid from linoleic acid can be illustrated as follows: 5 7 COOH isomerized linoleic acid 4 7 COOH linoleic acid $$\begin{array}{c} & & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & \\ & & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & &...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2930, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The solid polymers are mostly linear condensation products of diacids and diamines that range in molecular weights from 2,000 to 15,000. The liquid ones are highly branched, low molecular weights materials produced by condensations of the dimer acids with triamines and even higher polyamines. #### *7.3.3 Special Reac...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1640, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
$$H_2N$$ $NH_2$ + $HOOC$ $COOH$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2018, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
An example is formation of poly(m-phenylene diamine isophthalamide): N H N H O O n The polymer can be prepared in dimethylacetamide from isophthaloyl chloride and m-phenylene diamine in the presence of an acid scavenger at room temperature: $$\begin{array}{c\|ccccccccccccccccccccccccccccccccccc$$ Because the...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1371, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Silylated diamines can also condense with diphenyl esters of aromatic dicarboxylic acids [[114\]](#page-542-0): $$\begin{array}{c} H \\ N \\ Si \end{array} \begin{array}{c} H \\ N \\ Si \end{array} \begin{array}{c} H \\ N \\ Si \end{array} \begin{array}{c} H \\ N \\ Si \end{array} \begin{array}{c} H \\ N \\ Si \end...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2030, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
It was prepared in an attempt to form a polymer with superior heat stability and resistance to hydrolytic attacks [\[76](#page-541-0)]: $$\begin{array}{c\|c} F & F \\ \hline & N \\ \hline & N \end{array}$$ Mitsuru et al. [[113\]](#page-542-0) reported a direct synthesis of Nomex, an aromatic polyamide, mentioned abo...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2032, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
When aromatic diacids are employed, however, the products exhibit good heat stability and toughness. This led to a development of a number of useful materials. Three general methods are employed to form aromatic polyamide-imides [\[88](#page-542-0)]. The first one consists of an initial reaction of a mole of a diacid...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1802, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Other preparations of polyimides include the use of di-half esters of tetracarboxylic acids [92]: HO $$n$$ $OH$ $OH$ $OH$ $OH$ $OH$ $OH$ $OH$ $OH$ Polyimides can also be prepared by reactions of diimides with dihalides [93]: $$\begin{array}{cccccccccccccccccccccccccccccccccccc$$ 7.5 Polyimides 453...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 479, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Diels–Alder additions follow and result in formations of the polymers: Diels-Alder reactions yield other polyimides, as, for instance, the following [99]: 7.5 Polyimides 455 Also, N,N-bis(ethoxycarbonyl) pyromelitimide condenses with diamines to yield polyimides [\[100](#page-542-0)]: $$C_2H_5$$ $C_2H_5$ $C...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1952, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Interesting polyimides also form from reactions of 2,2<sup>0</sup> ,6,6<sup>0</sup> biphenyltetracarboxylic acid anhydride [\[101\]](#page-542-0) with aromatic diamines, like 4,4<sup>0</sup> -diaminodiphenyl ether: $$\begin{array}{c\|ccccccccccccccccccccccccccccccccccc$$ As in the previous cases, the polyamic acid f...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1987, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Large substituents can lead to carbon to carbon coupling instead of carbon to oxygen: O O The active catalyst is believed to be a basic cupric salt that forms through oxidation of cuprous chloride followed by complexation with two molecules of the amine [[102\]](#page-542-0): Cl Cu OH NR<sup>3</sup> NR<sup>3</sup...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1538, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Polyacetals and polyketals are polyethers that form (1) through condensations of glycols with carbonyl compounds, (2) by exchange reactions of acetals or ketals, and (3) by additions of diols to dialkenes [109]: $$\begin{array}{cccccccccccccccccccccccccccccccccccc$$ An acid-catalyzed exchange reaction of glycols an...	{ "Header 1": "7.7 Polyacetals and Polyketals", "token_count": 2025, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The intermediate, p-xylylene polymerizes spontaneously upon condensation on cooler surfaces [[106\]](#page-542-0): $$n$$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ The process was improved by using di-p-xylylene as an intermediate [\[106](#page-542-0)]. T...	{ "Header 1": "7.7 Polyacetals and Polyketals", "token_count": 1051, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Industrially important sulfur-containing polymers are polysulfones and polysulfides. The materials differ considerably in properties and in use. #### 7.9.1 Polysulfones These materials are an important group of engineering plastics. Aliphatic polysulfones were first synthesized at the end of the nineteenth centur...	{ "Header 1": "7.9 Sulfur-Containing Polymers", "token_count": 709, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
These polymers form from reactions of di thiols with aldehydes or ketones: $$\begin{array}{cccccccccccccccccccccccccccccccccccc$$ This reaction is used commercially to prepare an aromatic polymercaptan from p-bis (mecaptomethyl)benzene: $$_{n}$$ HS $_{n}$ HS $_{n}$ HS $_{n}$ SH $_{n}$ + $_{n}$ =0 $_{...	{ "Header 1": "7.9.2 Polythiols and Polymercaptans", "token_count": 1781, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The additions to the double bonds involve a series of hydrogen exchange reactions [108]: $$^{2}$$ HS $^{R}$ SH $^{2}$ $^{2}$ HS $^{R}$ S $\bullet$ $^{2}$ $^{2}$ HS $^{2}$ S $^{2}$ $^{2}$ HS $^{2}$ SH $^{2}$ $^{2}$ HS $^{2}$ SH $^{2}$ $^{2}$ SH $^{2}$ SH $^{2}$ SH $^{2}$ SH $^{2}...	{ "Header 1": "7.9.2 Polythiols and Polymercaptans", "token_count": 1625, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Difunctional reactants will produce linear polyurethanes: $$_{HO}$$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ ...	{ "Header 1": "7.9.2 Polythiols and Polymercaptans", "token_count": 1885, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The structure of the product can be shown as follows: NO NO NO Where, $$x = 2$$ or 3 Among other aromatic diisocyanates that are in commercial use are p-phenylene diisocyanate, mphenylene diisocyanate, 1-chloro-2,4-phenylene diisocyanate, 3,3<sup>0</sup> -dimethyl-4,4<sup>0</sup> -bisphenylene diisocyanate, 4,4...	{ "Header 1": "7.9.2 Polythiols and Polymercaptans", "token_count": 345, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Among them, the most investigated reactions are the ones of alcohols with isocyanates [[123\]](#page-543-0): $$\begin{array}{c} R \\ N \\ O \\ + R'OH \\ \hline \\ KOH \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hli...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 2542, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Electron donating groups, therefore, have an opposite effect. 7.10 Polyurethanes 471 Table 7.7 Relative effects of catalysts on reactivity of phenylisocyanate [[126,](#page-543-0) [127,](#page-543-0) [132\]](#page-543-0) \| Catalyst \| Relative rates of reactions<br>with n-butyl alcohol \| \|-------------...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 2036, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Thermoplastic elastomers exhibit physical properties that are similar to those of cast and millable elastomers at ambient temperatures. These materials, however, are not cross-linked and flow at elevated temperatures. They are fabricated like other thermoplastic polymers, are high in molecular weight, and are hydroxy...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 679, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The reaction sequences involve formations of alkoxide ions, followed by nucleophilic additions to the least hindered carbons [\[134](#page-543-0)]: HO $$\longrightarrow$$ HO $\longrightarrow$ HO $\longrightarrow$ HO $\longrightarrow$ HO $\longrightarrow$ HO $\longrightarrow$ HO $\longrightarrow$ HO $\lon...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 2010, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
A different route to the diglycidyl ethers is via Friedel–Craft reactions [[135\]](#page-543-0): Cl O + HO OH 0.1 - 0.2 % ZnCl2 Cl O C O l OH OH $$\begin{array}{c\|c} Na_2Si0_3 \bullet 5H_2O \\ \hline \end{array}$$ The higher molecular weight resins that form in the presence of caustic result from reactions of g...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 1561, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Another similar group of epoxy resins, called epoxy novolacs, forms from reactions of epichlorohydrin with low molecular weight phenolic novolacs (phenolic novolac resins are discussed in the next section): also $$\bigcap_{n}$$ + $\bigcap_{n}$ $\bigcap_{n}$ $\bigcap_{n}$ $\bigcap_{n}$ $\bigcap_{n}$ $\big...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 2034, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
These are condensation products of aromatic amines with epichlorohydrin. Following are some examples [[140\]](#page-543-0): $$H_2N$$ OH + 3 O CI as well as: N N O O O O The cross-linking reactions of tetrafunctional epoxy resins with aromatic primary diamines were investigated by spectoscopy [\[141](#page-543-0...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 576, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
These thermosetting resins form in reactions of phenols with formaldehyde in water in the presence of catalytic amounts of bases. Under these conditions, phenol exists as a resonance-stabilized anion: <sup>O</sup> <sup>O</sup> <sup>O</sup> <sup>O</sup> The addition of the phenol anion to formaldehyde is a typical n...	{ "Header 1": "7.12.1 Resols", "token_count": 1598, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
One is a direct SN2 displacement: O OH + O O O + OH O O + <sup>H</sup>2<sup>O</sup> The other one is addition of methylolated phenols to molecules of quinone methides that form at typical reaction conditions, particularly when the temperatures are elevated [[144–146\]](#page-543-0): $$\begin{array}{c} \begin{arra...	{ "Header 1": "7.12.1 Resols", "token_count": 3866, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
As the reaction continues, it leads to formation of trinuclear and tetra nuclear phenolic resins. A typical liquid resole is quite low in molecular weight. It may contain no more than two or three benzene rings. Carried a little further, the condensation yields a solid resole. The pH is usually adjusted to neutral be...	{ "Header 1": "7.12.1 Resols", "token_count": 1434, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The di benzylamine bridges form as follows [145]: OH OH OH $$+ NH_3$$ $(RNH_2)$ The overall mechanism can be shown as a special case of a Mannich reaction: $$(R) H \xrightarrow{\bullet} H + \bigoplus O \bigoplus (R) H \xrightarrow{\bullet} O \bigoplus H O \bigoplus H O \bigoplus H O \bigoplus H O \bigoplus H O \b...	{ "Header 1": "7.12.1 Resols", "token_count": 2151, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Methylol groups are still present in the finished resins to the extent of 15–30 groups per 100 phenol residues. The structures are branched and the degree of branching depends upon the amine used. #### 7.12.4 Typical Commercial Preparations The resols are usually prepared in typical reaction kettles, using 1.5–2....	{ "Header 1": "7.12.1 Resols", "token_count": 1677, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Melamine reacts with formaldehyde under slightly alkaline conditions to form mixtures of various methylolmelamines [155]: $$H_{2N}$$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2...	{ "Header 1": "7.12.1 Resols", "token_count": 1843, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The silicon atom is below carbon in the periodic table with a similar electronic arrangement, which in silicon is: $Is^2 2s^2 2p^6 3s^2 3p^2$ . The larger atomic radius, however, makes the silicon–silicon single bond much less energetic. Because of this, silanes $(Si_nH_{2n+2})$ are much less stable than alkanes. Th...	{ "Header 1": "7.14.1 Polysiloxanes", "token_count": 2019, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Within the range of molecular weights between 4,000 and 25,000, the materials are fluids of various viscosities. Most common commercial liquid polydimethyl siloxanes are prepared from dimethyl dichloro siloxane. Many elastomers are also based on dimethylsiloxane. Special polymers are prepared with other substituents. ...	{ "Header 1": "7.14.1 Polysiloxanes", "token_count": 1265, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Reactions of cyclic silazanes with arylene disalanols yield polymers with molecular weights as high as 900,000 [[164\]](#page-544-0): n HO Si $$\longrightarrow$$ Si O $\longrightarrow$ Si O $\longrightarrow$ Si O $\longrightarrow$ Si O $\longrightarrow$ HO Si O $\longrightarrow$ Si O $\longrightarrow$ HO ...	{ "Header 1": "7.14.1 Polysiloxanes", "token_count": 1414, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Polymers with silicon–silicon single bonds in the backbone have been known for some time. It was only within the last 10–15 years, however, that high molecular weight materials were developed [\[165](#page-544-0)]. Behind the current interest in these materials is a realization that they have various potential applicat...	{ "Header 1": "7.15 Polysilanes", "token_count": 2047, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
It is based on condensation of suitable Si–N–P precursors: $$\begin{array}{c\|ccccccccccccccccccccccccccccccccccc$$ where, R,R' = alkyl, aryl; $X = OCH_2CF_3$ , O-Ph. In this preparation, the desired substituents are introduced before the polymerization. The resultant polymers [179] are soluble in various solvent...	{ "Header 1": "7.15 Polysilanes", "token_count": 1180, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
This polymer is completely aromatic in character [\[182](#page-544-0)]. Polymerization of benzene to polyphenylene was, therefore, investigated quite thoroughly [[184,](#page-544-0) [185](#page-544-0)]. Benzene [\[186](#page-544-0)] and other aromatic structures [\[184](#page-544-0), [185](#page-544-0)] polymerize by w...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 2037, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The polymer is very stable up to 500–600C and oxidizes very slowly. It is, however, quite insoluble with a very high melting point that makes is difficult to process and even to determine its molecular weight. Introduction of irregularity into the polymeric structure by copolymerizing terphenyl, biphenyl, or tripheny...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 2002, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The reactions presumably proceed through Diels–Alder intermediates [199]: $$\begin{array}{cccccccccccccccccccccccccccccccccccc$$ Similarly, bis-sydnones condense with quinone [199]: $$0 \xrightarrow{H} 0 \xrightarrow{N} 0 \xrightarrow{N} 0 \xrightarrow{N} 0$$ The resultant polymers are not high in molecular wei...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 994, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Preformed bis-silanols are used in this particular example: n HO $$Si$$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ ...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 2043, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
A series of thermally stable, organic solvent-soluble polyimides were synthesized by reacting 3,7-diaminophenothiazinium chloride (thionine) with four different dianhydrides [243]. These polyimides can be illustrated as follows: $$\begin{bmatrix} N & O & O & O \\ N & O & O & O \\ S & O & O & O \\ CI & O & O & O \\ ...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 1983, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
These soluble polymers, prepared for photonic applications, can be illustrated as follows: N N O N O N N S S O O H O O N H #### 7.17.9 Poly(arylene ether)s and Poly(arylene ether ketone)s High-performance polymeric material are poly(arylene ether)s and poly(arylene ether ketone)s. They can be used as structural...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 2017, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }

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The original development by Ziegler led to what appears to be an almost endless number of patents for various coordination-type catalysts and processes. As described in Chap. 4, such catalysts have been vastly improved. Progress was made toward enhanced efficiency and selectivity. The amount of polymer produced per g...	{ "Header 1": "Chapter 6 Common Chain-Growth Polymers", "token_count": 2040, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The product generally has fewer than three branches per thousand carbon atoms [9]. Table 6.2 summarizes the properties of various polyethylenes. #### 6.1.4 Materials Similar to Polyethylene Materials that are quite similar to polyethylene can be obtained from other starting materials. The most prominent is format...	{ "Header 1": "Chapter 6 Common Chain-Growth Polymers", "token_count": 2013, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Further improvement was achieved by supporting TiCl<sup>3</sup> on MgCl<sup>2</sup> or by producing a supported catalyst by reacting TiCl<sup>4</sup> with Mg(OC2H5) or with other magnesium compounds. This raised the productivity to over 3,000 g of polymer for every gram of Ti [\[46](#page-408-0)]. The products, however...	{ "Header 1": "Chapter 6 Common Chain-Growth Polymers", "token_count": 2042, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The catalysts were deactivated and dissolved out of the products with alcohol containing some HCl, or removed by steam extraction. This was followed by extraction of the amorphous fractions with hot liquid hydrocarbons. Later bulk polymerization processes were developed where liquid propylene was either used as the o...	{ "Header 1": "Chapter 6 Common Chain-Growth Polymers", "token_count": 1452, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The original commercial methods for preparing high molecular weight polyisobutylene by cationic polymerization in good yields were reported in 1940. The reaction was carried out at -40 to $-80^{\circ}$ C in a diluent with BF<sub>3</sub> catalysis [72]. This developed into current commercial practices of polymerizing i...	{ "Header 1": "6.3 Polyisobutylene", "token_count": 1942, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Table 6.6 Properties of poly(a-olefin)s \| Monomer \| State \| MP (C) \| \|---------\|---------------------------------\|---------\| \| \| Crystalline \| 136 \| \| \| Crystalline \| 165–168 \| \| \| Crystalline \| 124–13...	{ "Header 1": "6.3 Polyisobutylene", "token_count": 1469, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Many copolymers of ethylene with a-olefins are prepared commercially. Thus ethylene is copolymerized with butene-1, where a comonomer is included to lower the regularity and the density of the polymer. Many copolymers are prepared with transition metal oxide catalysts on support. The comonomer is usually present in app...	{ "Header 1": "6.5.2 Copolymers of Ethylene with a-Olefins and Ethylene with Carbon Monoxide", "token_count": 1187, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
$$\begin{array}{c\|c} & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & &...	{ "Header 1": "6.5.2 Copolymers of Ethylene with a-Olefins and Ethylene with Carbon Monoxide", "token_count": 1347, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Various copolymers of ethylene with vinyl acetate are prepared by free-radical mechanism in emulsion polymerizations. Both reactivity ratios are close to 1.0 [[106\]](#page-409-0). The degree of branching in these copolymers is strongly temperature-dependent [[107\]](#page-409-0). These materials find wide use in such ...	{ "Header 1": "6.5.4 Copolymers of Ethylene with Vinyl Acetate", "token_count": 212, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Many different polymers of conjugated dienes are prepared commercially by a variety of processes, depending upon the need. They are formed by free-radical, ionic, and coordinated anionic polymerizations. In addition, various molecular weights homopolymers and copolymers, ranging from a few thousand for liquid polymers ...	{ "Header 1": "6.6 Homopolymers of Conjugated Dienes", "token_count": 1603, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
\| \| Microstructure (%) \| \| \| \|--------------------------------------\|--------------------\|-----------\|--------\| \| Catalyst \| Cis-1,4 \| Trans-1,4 \| 1,2 \| \| TiI4<br>/Al(C2H5<br>)3 \| 95 \| 2 ...	{ "Header 1": "6.6 Homopolymers of Conjugated Dienes", "token_count": 1999, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
#### 6.6.2.2 Synthetic Polyisoprenes In following natural rubber, the synthetic efforts are devoted to obtaining very high cis-1,4 polyisoprene and to forming a synthetic "natural" rubber. Two types of polymerizations yield products that approach this. One is through use of Ziegler–Natta type catalysts and the ot...	{ "Header 1": "6.6 Homopolymers of Conjugated Dienes", "token_count": 2040, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Ratios of Ti:Al between 0.5:1 and 1.5:1 yield the cis isomer. A 1:1 ratio is the optimum. Ratios of Ti:Al between 1.5:1 and 3:1 yield the trans structures [\[123](#page-409-0)]. The titanium to aluminum ratios also affect the yields of the polymers as well as the microstructures. There also is an influence on the m...	{ "Header 1": "6.6 Homopolymers of Conjugated Dienes", "token_count": 376, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Early attempts at preparations of synthetic rubbers resulted in developments of elastomers from 2,3-dimethylbutadiene. The material, called "methyl rubber," was claimed to yield better elastomeric properties than polybutadiene. Methyl rubber was produced in Germany during World War I where the monomer was prepared from...	{ "Header 1": "6.7 Methyl Rubber, Poly(2,3-dimethylbutadiene)", "token_count": 2028, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Thus, cis-1,4 syndiotactic polymers form in aromatic solvents and trans-1,2 in aliphatic ones. The preparations require cobalt halide/aluminum alkyl dichloride(or dialkyl chloride) catalysts in combinations with Lewis bases. To form a trans-1,4 structure, a catalyst containing aluminum to titanium ratio close to ...	{ "Header 1": "6.7 Methyl Rubber, Poly(2,3-dimethylbutadiene)", "token_count": 928, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Several different elastomers, copolymers of butadiene, are produced commercially. The major ones are copolymers of butadiene with styrene and butadiene with acrylonitrile. Some terpolymers, where the third component is an unsaturated carboxylic acid, are also manufactured. Block copolymers of isoprene with styrene and ...	{ "Header 1": "6.11 Copolymers of Dienes", "token_count": 1580, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Butadiene–acrylonitrile rubbers are another group of useful synthetic elastomers. These copolymers were originally developed in Germany where they were found superior in oil resistance to the butadiene–styrene rubbers. Commercially, these materials are produced by free-radical emulsion polymerization very similarly to ...	{ "Header 1": "6.11.2 GR-N Rubber", "token_count": 447, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Styrene is one of those monomers that lends itself to polymerization by free-radical, cationic, anionic and coordination mechanisms. This is due to several reasons. One is resonance stabilization of the reactive polystyryl species in the transition state that lowers the activation energy of the propagation reaction. An...	{ "Header 1": "6.12.1 Preparation of Polystyrene by Free-Radical Mechanism", "token_count": 2039, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Grassi and Zambelli claim that the syndiotactic styrene polymerization proceeds through a secondary insertion of styrene into Ti–alkyl (or growing polymer chain) bond. In the half titanocene catalyst, the polymer chain appears to be Z 6 -coordinated to the metal of the active species [[179\]](#page-410-0): $$\begin{a...	{ "Header 1": "6.12.1 Preparation of Polystyrene by Free-Radical Mechanism", "token_count": 2023, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The activity of the catalyst and the DP depend on the ratio of aluminum to titanium, the nature of the solvent, and on the aging of the catalyst [[189\]](#page-410-0). The optimum ratio of the aluminum alkyl to titanium chloride is 1.0–1.2. Mixing and aging of the catalyst must be done below room temperature, and the v...	{ "Header 1": "6.12.1 Preparation of Polystyrene by Free-Radical Mechanism", "token_count": 866, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Many copolymers of styrene are manufactured on a large commercial scale. Because styrene copolymerizes readily with many other monomers, it is possible to obtain a wide distribution of properties. Random copolymers form quite readily by free-radical mechanism [[185,](#page-410-0) [194\]](#page-411-0). Some can also be ...	{ "Header 1": "6.13 Copolymers of Styrene", "token_count": 205, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
For many applications, the homopolymer of styrene is too brittle. To overcome that, many different approaches were originally tried. These included use of high molecular weight polymers, use of plasticizers, fillers (glass fiber, wood flour, etc.), deliberate orientation of the polymeric chains, copolymerization and ad...	{ "Header 1": "6.13.1 High-Impact Polystyrene", "token_count": 2023, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The reaction with oxygen results in formation of low molecular weight polymeric peroxides that subsequently decompose to formaldehyde and methyl pyruvate [210]: $$O$$ + $O_2$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ $O$ Oxygen is less effective in inhibiting polymerizations of acrylic esters. It rea...	{ "Header 1": "6.13.1 High-Impact Polystyrene", "token_count": 2019, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
#### 6.14.2 Acrylic Elastomers Polymers of lower n-alkyl acrylates are used commercially to only a limited extent. Ethyl and butyl acrylates are, however, major components of acrylic elastomers. The polymers are usually formed by free-radical emulsion polymerization. Because acrylate esters are sensitive to h...	{ "Header 1": "6.13.1 High-Impact Polystyrene", "token_count": 2042, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The products, however, are often insoluble in such solvents. In addition, there is a tendency for the polymer to be yellow. This is due to some propagation taking place by 1,4 and by 3,4 insertion in addition to the 1,2 placement [[253,](#page-412-0) [254\]](#page-412-0): $$\begin{array}{c\|c} & & & \\ & & & \\ & & & ...	{ "Header 1": "6.13.1 High-Impact Polystyrene", "token_count": 2034, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Methacrylonitrile polymerizes readily in inert solvents. The polymer, depending on the initiator and on reaction conditions, is either amorphous or crystalline. Polymerizations take place over a broad range of temperatures from ambient to 5 C, when initiated by Grignard reagents, triphenyl ethylsodium, or sodium in l...	{ "Header 1": "6.13.1 High-Impact Polystyrene", "token_count": 379, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Commercially, acrylamide is formed from acrylonitrile by reaction with water. Similarly, the preferred commercial route to methacrylamide is through methacrylonitrile. Acrylamide polymerizes by free-radical mechanism [[270\]](#page-412-0). Water is the common solvent for acrylamide and methacrylamide polymerizations be...	{ "Header 1": "6.16 Polyacrylamide, Poly(acrylic acid), and Poly(methacrylic acid)", "token_count": 1759, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Mary different copolymers of fluoroolefins are possible and were reported in the literature. Commercial use of fluoroolefin copolymers, however, is restricted mainly to elastomers. Such materials offer superior solvent resistance and good thermal stability. The elastomers that are most important industrially are viny...	{ "Header 1": "6.17.5 Copolymers of Fluoroolefins", "token_count": 1006, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
These are poly(1,1-dihyroperfluorobutyl acrylate): $$\begin{array}{c\|c} \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline & F \\ \hline &...	{ "Header 1": "6.17.5 Copolymers of Fluoroolefins", "token_count": 1895, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Poly(vinyl chloride) is used in industry on a very large scale in many applications, such as rigid plastics, plastisols, and surface coatings. The monomer, vinyl chloride, can be prepared from acetylene: + HCl Cl The reaction is exothermic and requires cooling to maintain the temperature between 100 and 108C. The...	{ "Header 1": "6.17.7 Poly(vinyl chloride)", "token_count": 2026, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The crystalline areas are syndiotactic [[317,](#page-413-0) [318\]](#page-413-0). Poly(vinyl chloride) is soluble at room temperature in oxygen-containing solvents, such as ketones, esters, ethers, and others. It is also soluble in chlorinated solvents. The polymer, however, is not soluble in aliphatic and aromatic h...	{ "Header 1": "6.17.7 Poly(vinyl chloride)", "token_count": 2021, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Poly(vinyl alcohol) can be prepared from either poly(vinyl esters) or from poly(vinyl ethers). Commercially, however, it is prepared exclusively from poly(vinyl acetate). The preferred procedure is through a transesterification reaction using methyl or ethyl alcohols. Alkaline catalysts yield rapid alcoholyses. A typic...	{ "Header 1": "6.17.7 Poly(vinyl chloride)", "token_count": 735, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
- 1. Discuss copolymers of ethylene with propylene. How are they prepared? What catalysts are used in the preparations? How are ethylene–propylene rubbers cross-linked? - 2. What are the copolymers of ethylene with higher a-olefins and why are they prepared and how? - 3. Discuss the copolymers of ethylene with vinyl ac...	{ "Header 1": "Section 6.5", "token_count": 883, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
1. Discuss preparation, properties, and uses of poly(vinyl acetate). #### Section 6.19 1. How is poly(vinyl alcohol) prepared, used, and converted to poly(vinyl acetal)s? - 1. E.W. Fawcett, O.R. Gibson, M.W. Perrin, J.G. Paton, and E.G, Williams, Brit. Pat. # 571,590 (1937) - 2. R.O. Symcox and P. Ehrlich, *J. ...	{ "Header 1": "Section 6.18", "token_count": 2008, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
U.S. Patents # 3,134,642 (May 26, 1964); 2,980,664 (April 18, 1961); 3,055,878 (Sept,25, 1962); 3,216,987 (Nov. 9, 1596); 3,303,179 (Feb. 7, 1967); 3,328,375 (June 27, 1967); 3,362,916 (Jan 9 1964); 3,313,791 (April 11, 1967); 3,255,167 (June 7, 1966); German Patent # 1,236,789 (March 16, 1967); 1,234,218 (April 6, 196...	{ "Header 1": "Section 6.18", "token_count": 2037, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Polymer Sci., 1981, 36, 151 - 53. J. Lewis, P.E. Okieimen, and G.S. Park, J. Macromol. Sci.-Chem., 1982, A17, 1021 - 54. F.A. Bovey, K.B. Abbas, F.C. Schilling, and W.H. Starnes, Jr., Macromolecules,1975, 8, 437 - 55. D. O'Sullivan, Chem. Eng. News, p. 29 (July 4, 1983) - 56. D. Cam, E. Albizzati,...	{ "Header 1": "Section 6.18", "token_count": 2010, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Congress, Macromol. Prepr.,1971, 2, 712 - 92. C. Cozewith and G. Ver Strate, Macromolecules, 1971, 4, 482 - 93. A. Akimoto, J. Polymer Sci., Polymer Chem. Ed., 1972, 10, 3113 - 94. C.A. Lukach and H.M. Spurlin, in Copolymerization, (G.E. Ham, ed.), Interscience, N.Y., 1964 - 95. G. Natta, G. Mazzant...	{ "Header 1": "Section 6.18", "token_count": 1994, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
North, Polymer, 1966, 7(3), 113 - 133. W. Marconi, A. Mazzei, S. Cucinella, and M. Cesari, J. Polymer Sci., 1964, A-1,2, 426 - 134. G. Natta, M. Farina, M. Donati, and M. Peraldo, Chim. Ind. (Milan), 1960, 42, 1363 - 135. G. Natta, M. Farina, and M. Donati, Makromol. Chem., 1961, 43, 251 - 136. G....	{ "Header 1": "Section 6.18", "token_count": 2013, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Natta, J. Polymer Sci., 1955, 16, 143 - 173. C.G. Overberger, J. Polymer Sci., 1959, 35. 381 - 174. A.C. Shelyakov, Dokl. Akad. Nauk USSR, 1958, 122, 1076 - 175. D.Y. Yoon, P..R. Sundararajan, and P.J. Flory, Macromolecules, 1975, 8, 776 - 176. V.A. Kargin, V.A. Kabanov and II. Mardenko, Polym. *S...	{ "Header 1": "Section 6.18", "token_count": 2006, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Polymer Sci., 42, 367 (1960) - 217. F.J. Welch, U.S. Patent # 3,048,572 (Aug, 7, 1962) - 218. H. Nagai, J. Appl. Polymer Sci., 1963, 7, 1697 - 219. S. Smith, J. Polymer Sci., 1959, 38, 259 - 220. W.G. Gall and N.G. McCrum, J. Polymer Sci., 1961, 50, 489 - 221. M.R. Miller and G.E. Rauhut, J. Am. Chem*. ...	{ "Header 1": "Section 6.18", "token_count": 1979, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Chem., Japan, 1957, 27, 22 - 258. N. Shavit, A. Oplaka, and M. Levy, J. Polymer Sci., 1966, A-1,4, 2041 - 259. N. Shavit, M. Konigsbuch, and A. Oplaka, U.S. Patent #3,345,350 - 260. N. Shavit and M. Konigsbuch, J. Polymer Sci., 1967, C(16), 43 - 261. S. Amdur and N. Shavit, J. Polymer Sci. 1967, A-1,5, ...	{ "Header 1": "Section 6.18", "token_count": 1997, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Robila, J. Polymer Sci, Polymer Chem., Ed., 1978, 16, 2741 - 301. G. Vancso, 0. Egyed, S. Pekker, and A. Janossy, Polymer, 1982, 23, 14 - 302. K.H. Reichert and H.U. Moritz, J. Appi. Polymer Sci., 1981, 36, 151 - 303. L. Petiaud and O. Pham, Makromol. Chem., 1977, 78, 741 - 304. J.W.L. Fordham, P.H. Bur...	{ "Header 1": "Section 6.18", "token_count": 918, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Two types of monomers can undergo step-growth polymerizations [[1,](#page-540-0) [4,](#page-540-0) [5\]](#page-540-0). Both are polyfunctional, but one type possesses only one kind of functionality. An example is adipic acid that has two functional groups, but both are carboxylic acid groups. Another one is hexamethyle...	{ "Header 1": "7.1 Mechanism and Kinetics of Step-Growth Polymerization", "token_count": 219, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Kinetic considerations are of paramount importance in understanding the mechanism of step-growth polymerization [[1\]](#page-540-0). As stated in Chap. [1,](http://dx.doi.org/10.1007/978-1-4614-2212-9_1) chain-growth polymerizations take place in discreet steps. Each step is a reaction between two functional groups, li...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2031, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
When there is no catalyst present and the carboxylic acid assumes the role of a catalyst itself, then a third-order rate expression (shown above) must be employed: $$-d[M]/dt = k[M]^3$$ By integrating the third-order rate expression, one obtains: $$1/[M]^2 - 1/[M_o]^2 = 2kt$$ and, by substituting for [M] the Ca...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2039, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The Carothers equation, discussed above, states that $$p = (N_{\rm o} - N)/N_{\rm o}$$ where N<sup>o</sup> and N represent the quantities of monomer molecules present initially and at a conversion point p. The number of functional groups that have reacted at that point is 2(N<sup>o</sup> N). In the modifi...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2042, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The linear polyesters became 7.2 Polyesters 413 commercially important materials early in this century and still find many uses in industry. The earliest studies reported condensations of ethylene, trimethylene, hexamethylene, and decamethylene glycols with malonic, succinic, adipic, sebacic, and ortho phthalic a...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2018, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Substituted ureas form as by-products: $$RN$$ $NR$ + $RCOOH$ + $R'OH$ $\longrightarrow$ $RCOOR'$ + $ROOR'$ The reaction is useful in preparations of isoregic ordered chains with translational polar symmetry. It can also be applied in polymerizations of functional or chiral monomers. #### 7.2.1.2 Commerc...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2031, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
This polymer is also formed from dimethyl terephthalate and the diol by a transesterification reaction. The material has the following structure: O O O O n The polymer is stiffer than poly(ethylene terephthalate) and higher melting. 7.2 Polyesters 421 A polyester is being manufactured in Japan from a methyl est...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 2040, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
7.2 Polyesters 423 Table 7.1 Approximate melting points of polyesters \| Dicarboxylic acid \| Glycol \| C)<br>Tg<br>( \| C)<br>Tm<br>( \| \|-----------------------\|---------------\|---------------\|-----------------------\| \| HOOCCOOH \| HOCH2CH2OH \| – \| 172 ...	{ "Header 1": "7.1.1 Reactions of Functional Groups", "token_count": 1000, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The materials in this group are linear copolyesters. One of the dicarboxylic acids is an aliphatic unsaturated diacid. The unsaturation is introduced into the polymer backbone for the purpose of subsequent cross-linking. Unsaturated polyester technology was developed for use in glass fiber laminates, thermosetting mold...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 777, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The reaction was illustrated as follows: $$\bigcap_{R} + O = \bigcap_{O} O = \bigcap_{PPh_3} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O = \bigcap_{R} O...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2048, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
In the first one, called fatty acid process, a free fatty acid is coesterified directly with the dibasic acid and the polyol at 200–240°C. The reaction may be carried out without a solvent by first heating in an inert atmosphere. At the end, an inert gas may be blown into the resin from the bottom of the reaction ket...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2003, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The two polymers form from their cyclic dimers by cationic ring opening polymerizations with the aid of Lewis acids: O O O O O O n O O O O O O #### 7.3 Polyamides The family of synthetic polymeric materials with amide linkages in their backbones is large. It includes synthetic linear aliphatic polyamides, which c...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2030, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Here cyclohexane is converted in one step to cyclohexanone oxime hydrochloride [\[57](#page-541-0)]: NOCI $$hv$$ NO • + CI • + HCI $hv$ + NO • + HCI $hv$ NO • + HCI Another process uses ketene to form cyclohexene acetate [\[58](#page-541-0)]: $$\begin{array}{c\|ccccccccccccccccccccccccccccccccccc$$ Among som...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2036, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The process starts with telomerization of ethylene [\[66](#page-541-0)]. A free-radical polymerization of ethylene is conducted in the presence of chlorine compounds that act as chain-transferring agents. The reaction is 7.3 Polyamides 435 \| Table ' \| 73 \| Compositions of telome \| rc \| \|---------\|----\|---------------...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2034, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
$$\begin{array}{cccccccccccccccccccccccccccccccccccc$$ A 60–75% solution of the salt in water is then fed into a reaction kettle. In a typical batch process, some acetic acid may also be added if it is desired to limit molecular weight (10,000–15,000). The temperature in the reaction kettle is raised to 220°C, and ...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2029, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The melt viscosity of these materials, however, is generally low In any one series of melting points of polyamides, polymers that contain even numbers of methylene groups between amide linkages fall on a higher curve than those that contain odd ones do [72]. This is due to the crystalline arrangement of the polymeric...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 374, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
A formation of one such dimer acid from linoleic acid can be illustrated as follows: 5 7 COOH isomerized linoleic acid 4 7 COOH linoleic acid $$\begin{array}{c} & & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & & \\ & & \\ & & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & & \\ & &...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2930, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The solid polymers are mostly linear condensation products of diacids and diamines that range in molecular weights from 2,000 to 15,000. The liquid ones are highly branched, low molecular weights materials produced by condensations of the dimer acids with triamines and even higher polyamines. #### *7.3.3 Special Reac...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1640, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
$$H_2N$$ $NH_2$ + $HOOC$ $COOH$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $MH_2$ $...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2018, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
An example is formation of poly(m-phenylene diamine isophthalamide): N H N H O O n The polymer can be prepared in dimethylacetamide from isophthaloyl chloride and m-phenylene diamine in the presence of an acid scavenger at room temperature: $$\begin{array}{c\|ccccccccccccccccccccccccccccccccccc$$ Because the...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1371, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Silylated diamines can also condense with diphenyl esters of aromatic dicarboxylic acids [[114\]](#page-542-0): $$\begin{array}{c} H \\ N \\ Si \end{array} \begin{array}{c} H \\ N \\ Si \end{array} \begin{array}{c} H \\ N \\ Si \end{array} \begin{array}{c} H \\ N \\ Si \end{array} \begin{array}{c} H \\ N \\ Si \end...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2030, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
It was prepared in an attempt to form a polymer with superior heat stability and resistance to hydrolytic attacks [\[76](#page-541-0)]: $$\begin{array}{c\|c} F & F \\ \hline & N \\ \hline & N \end{array}$$ Mitsuru et al. [[113\]](#page-542-0) reported a direct synthesis of Nomex, an aromatic polyamide, mentioned abo...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 2032, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
When aromatic diacids are employed, however, the products exhibit good heat stability and toughness. This led to a development of a number of useful materials. Three general methods are employed to form aromatic polyamide-imides [\[88](#page-542-0)]. The first one consists of an initial reaction of a mole of a diacid...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1802, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Other preparations of polyimides include the use of di-half esters of tetracarboxylic acids [92]: HO $$n$$ $OH$ $OH$ $OH$ $OH$ $OH$ $OH$ $OH$ $OH$ Polyimides can also be prepared by reactions of diimides with dihalides [93]: $$\begin{array}{cccccccccccccccccccccccccccccccccccc$$ 7.5 Polyimides 453...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 479, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Diels–Alder additions follow and result in formations of the polymers: Diels-Alder reactions yield other polyimides, as, for instance, the following [99]: 7.5 Polyimides 455 Also, N,N-bis(ethoxycarbonyl) pyromelitimide condenses with diamines to yield polyimides [\[100](#page-542-0)]: $$C_2H_5$$ $C_2H_5$ $C...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1952, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Interesting polyimides also form from reactions of 2,2<sup>0</sup> ,6,6<sup>0</sup> biphenyltetracarboxylic acid anhydride [\[101\]](#page-542-0) with aromatic diamines, like 4,4<sup>0</sup> -diaminodiphenyl ether: $$\begin{array}{c\|ccccccccccccccccccccccccccccccccccc$$ As in the previous cases, the polyamic acid f...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1987, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Large substituents can lead to carbon to carbon coupling instead of carbon to oxygen: O O The active catalyst is believed to be a basic cupric salt that forms through oxidation of cuprous chloride followed by complexation with two molecules of the amine [[102\]](#page-542-0): Cl Cu OH NR<sup>3</sup> NR<sup>3</sup...	{ "Header 1": "7.2.2 Linear Unsaturated Polyesters", "token_count": 1538, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Polyacetals and polyketals are polyethers that form (1) through condensations of glycols with carbonyl compounds, (2) by exchange reactions of acetals or ketals, and (3) by additions of diols to dialkenes [109]: $$\begin{array}{cccccccccccccccccccccccccccccccccccc$$ An acid-catalyzed exchange reaction of glycols an...	{ "Header 1": "7.7 Polyacetals and Polyketals", "token_count": 2025, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The intermediate, p-xylylene polymerizes spontaneously upon condensation on cooler surfaces [[106\]](#page-542-0): $$n$$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ $\lambda$ The process was improved by using di-p-xylylene as an intermediate [\[106](#page-542-0)]. T...	{ "Header 1": "7.7 Polyacetals and Polyketals", "token_count": 1051, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Industrially important sulfur-containing polymers are polysulfones and polysulfides. The materials differ considerably in properties and in use. #### 7.9.1 Polysulfones These materials are an important group of engineering plastics. Aliphatic polysulfones were first synthesized at the end of the nineteenth centur...	{ "Header 1": "7.9 Sulfur-Containing Polymers", "token_count": 709, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
These polymers form from reactions of di thiols with aldehydes or ketones: $$\begin{array}{cccccccccccccccccccccccccccccccccccc$$ This reaction is used commercially to prepare an aromatic polymercaptan from p-bis (mecaptomethyl)benzene: $$_{n}$$ HS $_{n}$ HS $_{n}$ HS $_{n}$ SH $_{n}$ + $_{n}$ =0 $_{...	{ "Header 1": "7.9.2 Polythiols and Polymercaptans", "token_count": 1781, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The additions to the double bonds involve a series of hydrogen exchange reactions [108]: $$^{2}$$ HS $^{R}$ SH $^{2}$ $^{2}$ HS $^{R}$ S $\bullet$ $^{2}$ $^{2}$ HS $^{2}$ S $^{2}$ $^{2}$ HS $^{2}$ SH $^{2}$ $^{2}$ HS $^{2}$ SH $^{2}$ $^{2}$ SH $^{2}$ SH $^{2}$ SH $^{2}$ SH $^{2}...	{ "Header 1": "7.9.2 Polythiols and Polymercaptans", "token_count": 1625, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Difunctional reactants will produce linear polyurethanes: $$_{HO}$$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ $_{OH}$ ...	{ "Header 1": "7.9.2 Polythiols and Polymercaptans", "token_count": 1885, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The structure of the product can be shown as follows: NO NO NO Where, $$x = 2$$ or 3 Among other aromatic diisocyanates that are in commercial use are p-phenylene diisocyanate, mphenylene diisocyanate, 1-chloro-2,4-phenylene diisocyanate, 3,3<sup>0</sup> -dimethyl-4,4<sup>0</sup> -bisphenylene diisocyanate, 4,4...	{ "Header 1": "7.9.2 Polythiols and Polymercaptans", "token_count": 345, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Among them, the most investigated reactions are the ones of alcohols with isocyanates [[123\]](#page-543-0): $$\begin{array}{c} R \\ N \\ O \\ + R'OH \\ \hline \\ KOH \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hline \\ R' \\ \hli...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 2542, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Electron donating groups, therefore, have an opposite effect. 7.10 Polyurethanes 471 Table 7.7 Relative effects of catalysts on reactivity of phenylisocyanate [[126,](#page-543-0) [127,](#page-543-0) [132\]](#page-543-0) \| Catalyst \| Relative rates of reactions<br>with n-butyl alcohol \| \|-------------...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 2036, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Thermoplastic elastomers exhibit physical properties that are similar to those of cast and millable elastomers at ambient temperatures. These materials, however, are not cross-linked and flow at elevated temperatures. They are fabricated like other thermoplastic polymers, are high in molecular weight, and are hydroxy...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 679, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The reaction sequences involve formations of alkoxide ions, followed by nucleophilic additions to the least hindered carbons [\[134](#page-543-0)]: HO $$\longrightarrow$$ HO $\longrightarrow$ HO $\longrightarrow$ HO $\longrightarrow$ HO $\longrightarrow$ HO $\longrightarrow$ HO $\longrightarrow$ HO $\lon...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 2010, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
A different route to the diglycidyl ethers is via Friedel–Craft reactions [[135\]](#page-543-0): Cl O + HO OH 0.1 - 0.2 % ZnCl2 Cl O C O l OH OH $$\begin{array}{c\|c} Na_2Si0_3 \bullet 5H_2O \\ \hline \end{array}$$ The higher molecular weight resins that form in the presence of caustic result from reactions of g...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 1561, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Another similar group of epoxy resins, called epoxy novolacs, forms from reactions of epichlorohydrin with low molecular weight phenolic novolacs (phenolic novolac resins are discussed in the next section): also $$\bigcap_{n}$$ + $\bigcap_{n}$ $\bigcap_{n}$ $\bigcap_{n}$ $\bigcap_{n}$ $\bigcap_{n}$ $\big...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 2034, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
These are condensation products of aromatic amines with epichlorohydrin. Following are some examples [[140\]](#page-543-0): $$H_2N$$ OH + 3 O CI as well as: N N O O O O The cross-linking reactions of tetrafunctional epoxy resins with aromatic primary diamines were investigated by spectoscopy [\[141](#page-543-0...	{ "Header 1": "7.10.3 Chemical Reactions of the Isocyanates", "token_count": 576, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
These thermosetting resins form in reactions of phenols with formaldehyde in water in the presence of catalytic amounts of bases. Under these conditions, phenol exists as a resonance-stabilized anion: <sup>O</sup> <sup>O</sup> <sup>O</sup> <sup>O</sup> The addition of the phenol anion to formaldehyde is a typical n...	{ "Header 1": "7.12.1 Resols", "token_count": 1598, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
One is a direct SN2 displacement: O OH + O O O + OH O O + <sup>H</sup>2<sup>O</sup> The other one is addition of methylolated phenols to molecules of quinone methides that form at typical reaction conditions, particularly when the temperatures are elevated [[144–146\]](#page-543-0): $$\begin{array}{c} \begin{arra...	{ "Header 1": "7.12.1 Resols", "token_count": 3866, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
As the reaction continues, it leads to formation of trinuclear and tetra nuclear phenolic resins. A typical liquid resole is quite low in molecular weight. It may contain no more than two or three benzene rings. Carried a little further, the condensation yields a solid resole. The pH is usually adjusted to neutral be...	{ "Header 1": "7.12.1 Resols", "token_count": 1434, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The di benzylamine bridges form as follows [145]: OH OH OH $$+ NH_3$$ $(RNH_2)$ The overall mechanism can be shown as a special case of a Mannich reaction: $$(R) H \xrightarrow{\bullet} H + \bigoplus O \bigoplus (R) H \xrightarrow{\bullet} O \bigoplus H O \bigoplus H O \bigoplus H O \bigoplus H O \bigoplus H O \b...	{ "Header 1": "7.12.1 Resols", "token_count": 2151, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Methylol groups are still present in the finished resins to the extent of 15–30 groups per 100 phenol residues. The structures are branched and the degree of branching depends upon the amine used. #### 7.12.4 Typical Commercial Preparations The resols are usually prepared in typical reaction kettles, using 1.5–2....	{ "Header 1": "7.12.1 Resols", "token_count": 1677, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Melamine reacts with formaldehyde under slightly alkaline conditions to form mixtures of various methylolmelamines [155]: $$H_{2N}$$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2N}$ $H_{2...	{ "Header 1": "7.12.1 Resols", "token_count": 1843, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The silicon atom is below carbon in the periodic table with a similar electronic arrangement, which in silicon is: $Is^2 2s^2 2p^6 3s^2 3p^2$ . The larger atomic radius, however, makes the silicon–silicon single bond much less energetic. Because of this, silanes $(Si_nH_{2n+2})$ are much less stable than alkanes. Th...	{ "Header 1": "7.14.1 Polysiloxanes", "token_count": 2019, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Within the range of molecular weights between 4,000 and 25,000, the materials are fluids of various viscosities. Most common commercial liquid polydimethyl siloxanes are prepared from dimethyl dichloro siloxane. Many elastomers are also based on dimethylsiloxane. Special polymers are prepared with other substituents. ...	{ "Header 1": "7.14.1 Polysiloxanes", "token_count": 1265, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Reactions of cyclic silazanes with arylene disalanols yield polymers with molecular weights as high as 900,000 [[164\]](#page-544-0): n HO Si $$\longrightarrow$$ Si O $\longrightarrow$ Si O $\longrightarrow$ Si O $\longrightarrow$ Si O $\longrightarrow$ HO Si O $\longrightarrow$ Si O $\longrightarrow$ HO ...	{ "Header 1": "7.14.1 Polysiloxanes", "token_count": 1414, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Polymers with silicon–silicon single bonds in the backbone have been known for some time. It was only within the last 10–15 years, however, that high molecular weight materials were developed [\[165](#page-544-0)]. Behind the current interest in these materials is a realization that they have various potential applicat...	{ "Header 1": "7.15 Polysilanes", "token_count": 2047, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
It is based on condensation of suitable Si–N–P precursors: $$\begin{array}{c\|ccccccccccccccccccccccccccccccccccc$$ where, R,R' = alkyl, aryl; $X = OCH_2CF_3$ , O-Ph. In this preparation, the desired substituents are introduced before the polymerization. The resultant polymers [179] are soluble in various solvent...	{ "Header 1": "7.15 Polysilanes", "token_count": 1180, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
This polymer is completely aromatic in character [\[182](#page-544-0)]. Polymerization of benzene to polyphenylene was, therefore, investigated quite thoroughly [[184,](#page-544-0) [185](#page-544-0)]. Benzene [\[186](#page-544-0)] and other aromatic structures [\[184](#page-544-0), [185](#page-544-0)] polymerize by w...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 2037, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The polymer is very stable up to 500–600C and oxidizes very slowly. It is, however, quite insoluble with a very high melting point that makes is difficult to process and even to determine its molecular weight. Introduction of irregularity into the polymeric structure by copolymerizing terphenyl, biphenyl, or tripheny...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 2002, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
The reactions presumably proceed through Diels–Alder intermediates [199]: $$\begin{array}{cccccccccccccccccccccccccccccccccccc$$ Similarly, bis-sydnones condense with quinone [199]: $$0 \xrightarrow{H} 0 \xrightarrow{N} 0 \xrightarrow{N} 0 \xrightarrow{N} 0$$ The resultant polymers are not high in molecular wei...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 994, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
Preformed bis-silanols are used in this particular example: n HO $$Si$$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ $O$ $Si$ ...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 2043, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
A series of thermally stable, organic solvent-soluble polyimides were synthesized by reacting 3,7-diaminophenothiazinium chloride (thionine) with four different dianhydrides [243]. These polyimides can be illustrated as follows: $$\begin{bmatrix} N & O & O & O \\ N & O & O & O \\ S & O & O & O \\ CI & O & O & O \\ ...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 1983, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }
These soluble polymers, prepared for photonic applications, can be illustrated as follows: N N O N O N N S S O O H O O N H #### 7.17.9 Poly(arylene ether)s and Poly(arylene ether ketone)s High-performance polymeric material are poly(arylene ether)s and poly(arylene ether ketone)s. They can be used as structural...	{ "Header 1": "7.17.2 Polyphenylene", "token_count": 2017, "source_pdf": "datasets/websources/biochem/2012_Book_PrinciplesOfPolymerChemistry.pdf" }